conf: don't close the source element inside different function

While formatting disk or chardev element they both uses
virDomainDiskSourceDefFormatSeclabel() function which also closes
the source element.  This is not extendable.

Use the new virXMLFormatElement() to properly format the source
element with possible child elements.

As a side effect it fixes a bug in disk source formatting.
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/conf/domain_conf.c

@@ -21500,14 +21500,8 @@ virDomainDiskSourceDefFormatSeclabel(virBufferPtr buf,
     size_t n;
 
     if (nseclabels && !skipSeclables) {
-        virBufferAddLit(buf, ">\n");
-        virBufferAdjustIndent(buf, 2);
         for (n = 0; n < nseclabels; n++)
             virSecurityDeviceLabelDefFormat(buf, seclabels[n], flags);
-        virBufferAdjustIndent(buf, -2);
-        virBufferAddLit(buf, "</source>\n");
-    } else {
-        virBufferAddLit(buf, "/>\n");
     }
 }
 
@@ -21580,6 +21574,10 @@ virDomainDiskSourceFormatInternal(virBufferPtr buf,
                                   bool skipSeclabels)
 {
     const char *startupPolicy = NULL;
+    virBuffer attrBuf = VIR_BUFFER_INITIALIZER;
+    virBuffer childBuf = VIR_BUFFER_INITIALIZER;
+
+    virBufferSetChildIndent(&childBuf, buf);
 
     if (policy)
         startupPolicy = virDomainStartupPolicyTypeToString(policy);
@@ -21587,51 +21585,45 @@ virDomainDiskSourceFormatInternal(virBufferPtr buf,
     if (src->path || src->nhosts > 0 || src->srcpool || startupPolicy) {
         switch ((virStorageType)src->type) {
         case VIR_STORAGE_TYPE_FILE:
-            virBufferAddLit(buf, "<source");
-            virBufferEscapeString(buf, " file='%s'", src->path);
-            virBufferEscapeString(buf, " startupPolicy='%s'", startupPolicy);
+            virBufferEscapeString(&attrBuf, " file='%s'", src->path);
+            virBufferEscapeString(&attrBuf, " startupPolicy='%s'", startupPolicy);
 
-            virDomainDiskSourceDefFormatSeclabel(buf, src->nseclabels,
+            virDomainDiskSourceDefFormatSeclabel(&childBuf, src->nseclabels,
                                                  src->seclabels, flags,
                                                  skipSeclabels);
             break;
 
         case VIR_STORAGE_TYPE_BLOCK:
-            virBufferAddLit(buf, "<source");
-            virBufferEscapeString(buf, " dev='%s'", src->path);
-            virBufferEscapeString(buf, " startupPolicy='%s'", startupPolicy);
+            virBufferEscapeString(&attrBuf, " dev='%s'", src->path);
+            virBufferEscapeString(&attrBuf, " startupPolicy='%s'", startupPolicy);
 
-            virDomainDiskSourceDefFormatSeclabel(buf, src->nseclabels,
+            virDomainDiskSourceDefFormatSeclabel(&childBuf, src->nseclabels,
                                                  src->seclabels, flags,
                                                  skipSeclabels);
             break;
 
         case VIR_STORAGE_TYPE_DIR:
-            virBufferAddLit(buf, "<source");
-            virBufferEscapeString(buf, " dir='%s'", src->path);
-            virBufferEscapeString(buf, " startupPolicy='%s'", startupPolicy);
-            virBufferAddLit(buf, "/>\n");
+            virBufferEscapeString(&attrBuf, " dir='%s'", src->path);
+            virBufferEscapeString(&attrBuf, " startupPolicy='%s'", startupPolicy);
             break;
 
         case VIR_STORAGE_TYPE_NETWORK:
             if (virDomainDiskSourceFormatNetwork(buf, src) < 0)
-                return -1;
+                goto error;
             break;
 
         case VIR_STORAGE_TYPE_VOLUME:
-            virBufferAddLit(buf, "<source");
-
             if (src->srcpool) {
-                virBufferEscapeString(buf, " pool='%s'", src->srcpool->pool);
-                virBufferEscapeString(buf, " volume='%s'",
+                virBufferEscapeString(&attrBuf, " pool='%s'", src->srcpool->pool);
+                virBufferEscapeString(&attrBuf, " volume='%s'",
                                       src->srcpool->volume);
                 if (src->srcpool->mode)
-                    virBufferAsprintf(buf, " mode='%s'",
+                    virBufferAsprintf(&attrBuf, " mode='%s'",
                                       virStorageSourcePoolModeTypeToString(src->srcpool->mode));
             }
-            virBufferEscapeString(buf, " startupPolicy='%s'", startupPolicy);
+            virBufferEscapeString(&attrBuf, " startupPolicy='%s'", startupPolicy);
 
-            virDomainDiskSourceDefFormatSeclabel(buf, src->nseclabels,
+            virDomainDiskSourceDefFormatSeclabel(&childBuf, src->nseclabels,
                                                  src->seclabels, flags,
                                                  skipSeclabels);
             break;
@@ -21640,11 +21632,19 @@ virDomainDiskSourceFormatInternal(virBufferPtr buf,
         case VIR_STORAGE_TYPE_LAST:
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("unexpected disk type %d"), src->type);
-            return -1;
+            goto error;
         }
+
+        if (virXMLFormatElement(buf, "source", &attrBuf, &childBuf) < 0)
+            goto error;
     }
 
     return 0;
+
+ error:
+    virBufferFreeAndReset(&attrBuf);
+    virBufferFreeAndReset(&childBuf);
+    return -1;
 }
 
 
@@ -23070,11 +23070,15 @@ virDomainChrAttrsDefFormat(virBufferPtr buf,
     return 0;
 }
 
-static void
+static int
 virDomainChrSourceDefFormat(virBufferPtr buf,
                             virDomainChrSourceDefPtr def,
                             unsigned int flags)
 {
+    virBuffer attrBuf = VIR_BUFFER_INITIALIZER;
+    virBuffer childBuf = VIR_BUFFER_INITIALIZER;
+
+    virBufferSetChildIndent(&childBuf, buf);
 
     switch ((virDomainChrType)def->type) {
     case VIR_DOMAIN_CHR_TYPE_NULL:
@@ -23092,14 +23096,17 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
         if (def->type != VIR_DOMAIN_CHR_TYPE_PTY ||
             (def->data.file.path &&
              !(flags & VIR_DOMAIN_DEF_FORMAT_INACTIVE))) {
-            virBufferEscapeString(buf, "<source path='%s'",
+            virBufferEscapeString(&attrBuf, " path='%s'",
                                   def->data.file.path);
             if (def->type == VIR_DOMAIN_CHR_TYPE_FILE &&
                 def->data.file.append != VIR_TRISTATE_SWITCH_ABSENT)
-                virBufferAsprintf(buf, " append='%s'",
+                virBufferAsprintf(&attrBuf, " append='%s'",
                     virTristateSwitchTypeToString(def->data.file.append));
-            virDomainSourceDefFormatSeclabel(buf, def->nseclabels,
+            virDomainSourceDefFormatSeclabel(&childBuf, def->nseclabels,
                                              def->seclabels, flags);
+
+            if (virXMLFormatElement(buf, "source", &attrBuf, &childBuf) < 0)
+                goto error;
         }
         break;
 
@@ -23130,19 +23137,21 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
         break;
 
     case VIR_DOMAIN_CHR_TYPE_TCP:
-        virBufferAsprintf(buf, "<source mode='%s' ",
+        virBufferAsprintf(&attrBuf, " mode='%s' ",
                           def->data.tcp.listen ? "bind" : "connect");
-        virBufferEscapeString(buf, "host='%s' ", def->data.tcp.host);
-        virBufferEscapeString(buf, "service='%s'", def->data.tcp.service);
+        virBufferEscapeString(&attrBuf, "host='%s' ", def->data.tcp.host);
+        virBufferEscapeString(&attrBuf, "service='%s'", def->data.tcp.service);
         if (def->data.tcp.haveTLS != VIR_TRISTATE_BOOL_ABSENT &&
             !(flags & VIR_DOMAIN_DEF_FORMAT_MIGRATABLE &&
               def->data.tcp.tlsFromConfig))
-            virBufferAsprintf(buf, " tls='%s'",
+            virBufferAsprintf(&attrBuf, " tls='%s'",
                     virTristateBoolTypeToString(def->data.tcp.haveTLS));
         if (flags & VIR_DOMAIN_DEF_FORMAT_STATUS)
-            virBufferAsprintf(buf, " tlsFromConfig='%d'",
+            virBufferAsprintf(&attrBuf, " tlsFromConfig='%d'",
                               def->data.tcp.tlsFromConfig);
-        virBufferAddLit(buf, "/>\n");
+
+        if (virXMLFormatElement(buf, "source", &attrBuf, &childBuf) < 0)
+            goto error;
 
         virBufferAsprintf(buf, "<protocol type='%s'/>\n",
                           virDomainChrTcpProtocolTypeToString(
@@ -23151,11 +23160,14 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
 
     case VIR_DOMAIN_CHR_TYPE_UNIX:
         if (def->data.nix.path) {
-            virBufferAsprintf(buf, "<source mode='%s'",
+            virBufferAsprintf(&attrBuf, " mode='%s'",
                               def->data.nix.listen ? "bind" : "connect");
-            virBufferEscapeString(buf, " path='%s'", def->data.nix.path);
-            virDomainSourceDefFormatSeclabel(buf, def->nseclabels,
+            virBufferEscapeString(&attrBuf, " path='%s'", def->data.nix.path);
+            virDomainSourceDefFormatSeclabel(&childBuf, def->nseclabels,
                                              def->seclabels, flags);
+
+            if (virXMLFormatElement(buf, "source", &attrBuf, &childBuf) < 0)
+                goto error;
         }
         break;
 
@@ -23175,7 +23187,12 @@ virDomainChrSourceDefFormat(virBufferPtr buf,
         virBufferAddLit(buf, "/>\n");
     }
 
-    return;
+    return 0;
+
+ error:
+    virBufferFreeAndReset(&attrBuf);
+    virBufferFreeAndReset(&childBuf);
+    return -1;
 }
 
 static int

tests/qemuxml2xmloutdata/qemuxml2xmlout-seclabel-dynamic-labelskip.xml

@@ -15,8 +15,7 @@
   <devices>
     <emulator>/usr/bin/qemu-system-i686</emulator>
     <disk type='block' device='disk'>
-      <source dev='/dev/HostVG/QEMUGuest1'>
-      </source>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
       <target dev='hda' bus='ide'/>
       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
     </disk>